how to add infos to Objectlistview from another form

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C#

i face problem with Objectlistview , when i add infos to the form it doesn't addd into Objectlistview , and it show me this message:
System.InvalidCastException: Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'BrightIdeasSoftware.OLVListItem'.
this is my code :

           //add infos to the OLV
    string [] tab = new string[11];
    tab[0] = TbNumLocations.Text;
    tab[1] = CBListNomClient.Text;
    tab[2] = CBListMatriculeVoiture.Text;
    tab[3] = DtpDateLocation.Text;
    tab[4] = DtpDateRetour.Text;
    tab[5] = TbPrixLocation.Text;
    tab[6] = TbnbJourLocation.Text;
    tab[7] = sTotal.ToString();
    tab[8] = CbTypeGarantie.Text;
    tab[9] = TbMontantGarantie.Text;
    tab[10] = sIdTelephone.ToString();


_MForm.OlvLocationVoitures.Items.Add(new ListViewItem(tab)); //(new OLVListItem(tab));